title: The quality control of MHC class I peptide loading.
abstract: The assembly of major histocompatibility complex (MHC) class I molecules is one of the more widely studied examples of protein folding in the endoplasmic reticulum (ER). It is also one of the most unusual cases of glycoprotein quality control involving the thiol oxidoreductase ERp57 and the lectin-like chaperones calnexin and calreticulin. The multistep assembly of MHC class I heavy chain with beta(2)-microglobulin and peptide is facilitated by these ER-resident proteins and further tailored by the involvement of a peptide transporter, aminopeptidases, and the chaperone-like molecule tapasin. Here we summarize recent progress in understanding the roles of these general and class I-specific ER proteins in facilitating the optimal assembly of MHC class I molecules with high affinity peptides for antigen presentation.
authors.affiliation: Department of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, 300 Cedar Street, New Haven, CT 06520-8011, United States.
authors.forename: Pamela A
authors.initials: PA
authors.lastname: Wearsch
authors.forename: Peter
authors.initials: P
authors.lastname: Cresswell
mesh_terms: D000818:Animals; D017951:Antigen Presentation; D004721:Endoplasmic Reticulum / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000378:metabolism*; D006801:Humans; D026901:Membrane Transport Proteins / Q000378:metabolism; D008954:Models, Biological; D010455:Peptides / Q000276:immunology* / Q000378:metabolism; D019704:Protein Disulfide-Isomerases / Q000378:metabolism
chemical_list: D015395:Histocompatibility Antigens Class I; D026901:Membrane Transport Proteins; D010455:Peptides; C107762:tapasin; D019704:Protein Disulfide-Isomerases